JPS622267B2 - - Google Patents
Info
- Publication number
- JPS622267B2 JPS622267B2 JP53142771A JP14277178A JPS622267B2 JP S622267 B2 JPS622267 B2 JP S622267B2 JP 53142771 A JP53142771 A JP 53142771A JP 14277178 A JP14277178 A JP 14277178A JP S622267 B2 JPS622267 B2 JP S622267B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- current collecting
- current
- chamber
- radiation source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005855 radiation Effects 0.000 claims description 35
- 239000000779 smoke Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 15
- 239000012857 radioactive material Substances 0.000 claims description 13
- 239000011810 insulating material Substances 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 2
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 150000002500 ions Chemical class 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000011888 foil Substances 0.000 description 4
- 239000000941 radioactive substance Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000005865 ionizing radiation Effects 0.000 description 3
- LXQXZNRPTYVCNG-YPZZEJLDSA-N americium-241 Chemical compound [241Am] LXQXZNRPTYVCNG-YPZZEJLDSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
- G08B17/113—Constructional details
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4815477 | 1977-11-18 | ||
| GB7832913 | 1978-08-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5494094A JPS5494094A (en) | 1979-07-25 |
| JPS622267B2 true JPS622267B2 (en]) | 1987-01-19 |
Family
ID=26266218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14277178A Granted JPS5494094A (en) | 1977-11-18 | 1978-11-17 | Smoke detector |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4361763A (en]) |
| JP (1) | JPS5494094A (en]) |
| CA (1) | CA1115860A (en]) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0263207A (ja) * | 1988-08-30 | 1990-03-02 | Fujitsu Ltd | 静磁波デバイス |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58186463U (ja) * | 1982-06-07 | 1983-12-10 | 能美防災株式会社 | イオン化式煙感知器 |
| US4937562A (en) * | 1987-12-26 | 1990-06-26 | Hochiki Corp. | Moisture-proof ionization smoke detector |
| JPH02307198A (ja) * | 1989-05-22 | 1990-12-20 | Hochiki Corp | イオン化式煙感知器 |
| US6151189A (en) * | 1998-12-28 | 2000-11-21 | Western Digital Corporation | Disk drive spindle motor with embedded ionizing source for static charge dissipation |
| US6953936B2 (en) * | 2002-06-27 | 2005-10-11 | Honeywell International, Inc. | Ionization type smoke sensing chamber |
| US8004782B1 (en) | 2009-03-19 | 2011-08-23 | Western Digital Technologies, Inc. | Tester with virtual ground |
| US11385212B2 (en) * | 2020-09-25 | 2022-07-12 | Honeywell International Inc. | Smoke detection sample point |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4012729A (en) * | 1975-06-19 | 1977-03-15 | Statitrol Corporation | Multi-element ionization chamber |
| US4150373A (en) * | 1977-01-27 | 1979-04-17 | Ried Jr Louis | Ionization particle detector |
| US4286160A (en) * | 1977-01-27 | 1981-08-25 | Ried Jr Louis | Ionization particle detector |
| US4185197A (en) * | 1978-01-13 | 1980-01-22 | General Electric Company | Arrangement for inhibiting the effect of extraneous electric fields on an improved ionization smoke detector |
-
1978
- 1978-11-14 CA CA316,184A patent/CA1115860A/en not_active Expired
- 1978-11-17 JP JP14277178A patent/JPS5494094A/ja active Granted
-
1980
- 1980-11-25 US US06/210,395 patent/US4361763A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0263207A (ja) * | 1988-08-30 | 1990-03-02 | Fujitsu Ltd | 静磁波デバイス |
Also Published As
| Publication number | Publication date |
|---|---|
| US4361763A (en) | 1982-11-30 |
| JPS5494094A (en) | 1979-07-25 |
| CA1115860A (en) | 1982-01-05 |
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